Journal of Applied Physiology
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J Appl Physiol 89: 1879-1883, 2000;
8750-7587/00 $5.00
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Vol. 89, Issue 5, 1879-1883, November 2000

Stability and change in genetic and environmental influences on hand-grip strength in older male twins

Dorit Carmelli1 and Terry Reed2

1 Center for Health Sciences, SRI International, Menlo Park, California 94025; and 2 Department of Medical Genetics, Indiana University School of Medicine, Indianapolis, Indiana 46202

The aim of this study was to investigate aging-related changes in the contribution of genetic and environmental influences to hand-grip strength in late adulthood. Subjects in this study are 152 intact twin pairs (77 monozygotic and 75 dizygotic pairs) from the National Heart, Lung, and Blood Institute Twin Study assessed repeatedly for hand-grip strength at mean ages of 63 and 73 yr. Structural equation genetic modeling was used to investigate stability and change in the genetic and environmental components of variance of hand-grip strength in late adulthood. Average decline in strength over the 10 yr of follow-up was -1.05 ± 6.8 (SD) kg and was highly significant (P = 0.003). The test-retest correlation between baseline and follow-up grip strength was 0.62 (P < 0.001). Bivariate genetic modeling found significant genetic and shared environmental stability in hand-grip strength over the 10 yr of follow-up, with genetic and shared environmental influences accounting for 35 and 48%, respectively, of the test-retest phenotypic correlation. We conclude from these results that stability in hand-grip strength in late adulthood is due primarily to continuity of genetic and familial influences.

elderly; heritability; genetic and environmental influences


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